Coastale Tek makes a good camera with plenty of cable. I am sure there are other brands/companies out there. Find the AV hook ups, mount the camera and be sure to route your wire securely. Less the 100 bucks.

I will probably order one of these cameras and test it out when my car gets delivered. It looks like I just need to find the A/V feeds for the camera and it is a simple connection. I'm guessing the camera just mounts on the license plate somehow. The only other thing that I would love to have is those front sensors. Can those be purchased after market?